Improvement in door and alarm-bells



G. 0. LAGKEY. DOOR AND ALARM BELL.

No. 108,708; I Patented Oct. 25, 1870.

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pawl (tfiiiw carat scat Letters Patent N5. roams, dated October 25, 1379:

IMPROVEMENT IN DOOR AND ,ALARM-BELIS- I The Schedule referred to in thaehetters Patent and making part ol thcs'ame.

vthat the following is a full, clear, and exact specification thereof.

Nature and Object of my I Mention.

My invention relates to that class of door-bells which is secured to the body of the door, and is operatedby a crank or knob on theoutside of the door; and

The first 'part of my invention relates to the com-- bination with the door-crank shaftiof a wheel having two or more'radial slots formed at an angle with each other in its face, and uniting at the center of said face, whereby I obtain a simple mechanismfor 0 crating the bell-hammer whenever the crank or kno -on the outside of the door 'is turned in either direction.

The second part of my invention relates to the novel construction of a liberating and lockingdevice which is combined with the door, and an alarm mechanism contained in the gong or ball, so that, when properly adjusted, it will liberate the alarm mechanism and lock or hold the door closed in case any person attempt to open it, thusgiving an alarm in case stragglers or thieves attempt an entrance to the house.

a Description of Accompanying Drawing. Figure 1 is a View showing the application of my improvements, the gong being removed to show the working parts.

Figure 2 is a. plan of the same, with the lower half of the gong shown in plan.

Figure. 3 is a perspective view of one half of the .wheel on the door-crank shaft.

Figure 4 is a view of the latch-piece for the doorjamb.

General Description.

A'X'GPI'GSQHt-S a door, which is hinged in the doorframe B B, and on which is secured the base,--G, of the door-bell.

The hell or gong M is secured on a post, 0, in the base G, and the door-crank shaft R extends through the base G and. door A, and has the crank S (or a knob, if preferred) secured on the end outside of the door, as indicated by dotted lines in fig. l, and as shown in plan in fig. 2.

The wheel P Q consists of the body Q, made in the form of a circular box, and secured on the crank-shaft R either by means of a screw-or rivet, or by casting the shaft It and body Q in one piece, or in any other suitable manner.

The plate P, which forms the other nart of the wheel I? Q, is a sheet brass or light cast plate, in which is formed the radial slots 0', s, and t, which are arranged at an angle of about one hundred and twenty degrees from'cach other, and which merge into each other at the center of the plate, asfshown in fig. 1. I

The plate 1? is secured on the body Q by one or more screws, passing through holes in the plate, as indicated, and screwing into holes 'or lugs in or entire body Q.

The hammer T is secured on the arm U, which is pivoted on the base G, and'is forced against the bell or gong M. by the spring Y, which is secured on the base G, and has one end secured in a hole in the arm U, as shown in fig..1.

The rod \V has one end bent down and pivoted in a hole in the arm U, and the other end is bent down at right. angles to the body of the rod, and extends through the slot r, where it is secured in the washer X, which is arranged underneath the plate P, and between said plate and the body Q, within 'the box "shaped cavity in said body.

The pin m is secured in the baseG, and limits the --forwardmotion of the hammetearm U.

From this description it is seen that when the wheel 1? Q is rotated by means of the crank S, the bent end of the rod W will remain at the head of the slot 7' until said slot is thrown over into nearly the position now occupied by the slot s or t, (depending on the direction in which the crank was turned,) which will draw back the hammer-arm U and compress the spring V.

When the slot 4* has been brought into this position, the force of the spring V causes the bent end of the rod W to slide along the slot '1' and up the slots or t, (depending on the direction in which the crank was turned,) which causes a forward motion of thehammer-arm U, and a blow of the hammer T on the gong M, as is readily seen.

The washer X slides along under the plate P during this forward motion, and serves to hold the bent end of the rod W in the slots 1' s or t inthe plate P.

The alarm-mechanism is of the ordinary construction used in clocks, and consists of the plates 1 l, united by the posts 1 3 y, and having the shafts k, t and 'n journaled between them.

The spring K has one end attached to a post, y, and the other end to the shaft It, and a ratchet-wheel (not shown in drawing) is secured on the said shaft It.

The gear-wheel J is journaled on the shatt k, and has a spring-pawllnot shown in drawing) on its rear face, which engages with the teeth of theratchet-wheel on the shaft is, and thus transmits the power to the wheel J from the spring K when drawn up.

The wheel J meshes into the piuionN, (see fi on the shaft Land on this shaft is secured the escapcment-wheel l.

The pallets L are secured on the rock-shaft n, and engage with the teeth of the cscapement-wheel 1, and the hammer-arm g is secured in said rock-shaft, and has the gong-hammer-H- at its end.

menus The lever F is pivoted at p to the baseG, and has a notch near its upper end, upon which rests an arm, 72, which is secured in the rock-shaft 'n.

Thecord, wire, or chain l) is attached to thenpper end of the lever I and its other end is attached to the liberating-piece D.

i The liberating-piece 1) consists of a plate of metal, having a weight, E, at its lower end,- and having the slot'd and notch a formed in its other end, and it is secured on the door A by means of a screw, f, passing through the $1064, as shown in fig. 1.

The latch-plate .0 isthstened on the dpor-jamb B, and has the notches e and a ciit in its lower edge, the notch 0 being formed'close up to the jamb B, and the notch a extending up from the notch c, as shown in ii 4L To set the alarm mechanism, the door A is closed,

and the piece D is brought up so as to bring the notch cover the screw f, and the upper end of the piece 1) into the notch'c in the latch-plate C, as shown in fig. 1. The cord 1) is thus slackened up, as shown, so that 'the lever F can be turned back under the arm lnwhich will prevent any motion of the rock-shaft n, and will allow the alarm 'to be wound up by means of a key inserted through a hole in the gong M onto the end of the driving-shaft 7;.

Now, it an attempt be made to open the door A, the piece D will be forced forward out of the notch c and will tilt up into the notch e, as indicated by dotted lines E in fig. 1, by. reason of the weight E at the lower end of said piece.

This tilting will drawon the cord 7) and pull the lever F'fiom'nnder the arm 7:, thus releasing the rockshaft it,"a,nd givingthe alarm by the hammer H on the gong M,:and the tilting of the piece D into the notch a will, at the same time, hold thedoor against any attempts to open it from the outside.

When the alarm mechanism is not required, the

7 piece D is raisedup so as to free the notch efrom the screw f, and is then dropped into the position indicated by dotted lines E in fig. 1.

Claims.

What I claim herein as new, and of my invention, and desire to secure by Letters Patent, is-- 1. The wheel P Q, provided with the plate I, having two or more radial slots '1' s'formed therein, as described, in combination with the shaft R and crank or knob S, substantial] y as and for the purpose specified.

2. The hammer-arm U and rod V, with sliding washer X, orit-s equivalent, in combination with the wheel P Q, provided with the radial slots *1 8, substantially as and for the purpose specified.

3. The combination of the crank-shaft R with crank or knob S, wheel P Q with radial slots 1' s, rod \V with sliding washer X, hammer-arm U'with hammer'T, bow-spring V, and gong M, the several parts being arranged and operating substantially as and for the purpose specified.

, 4. The liberating-piece D, provided with the counter-weight E, and having the slot (1 and notch 0 formed therein, substantially as and for the purpose specified.

5. The latch-piece 0, having the notches c and a formed therein, as shown,.substantially as and for the purpose specified.

6. The combination ofthe latch-piece O with notches c a, liberating-piece D with counter-weight E, slot (1, and notch 42, cord b, lever F, arm h, alarm mechanism H L I N J. K, and gong M, the several parts being arranged and operating substantially as and for the purpose specified.

As evidence of the foregoing, witness my hand this 10th day of September, A. D. 1870.

GASWAY 0. LAOKEY.

Witnesses J on ABBOTT, -Axn. GHOFFIN. 

